All NA SVT I would assume Stg 1 would be plenty. I got a stg 2 cuz at the time I planned on getting the FSWerks turbo kit and wanted a clutch taht was beefier than stock but couldn't afford a stg 3 at the time. And I needed a new clutch as the stock one was shot.
Look at the torque ratings of each clutch... If I recall a stg 1 clutch has more gripping force than the svt with a tune can produce torquewise
'03 VW Passat W8 6MT
'04 VW R32 - (O:o)=R32=W====(o:O)